1,721,012 research outputs found
Corrigendum to "Insights into sucrose pathway of chicory stems by integrative transcriptomic and metabolic analyses" [Phytochemistry Vol. 167 (November 2019) 112086
No full textTestone, Giulio, Sobolev, Anatoly, Gonnella, Maria, Renna, Massimiliano, Mannina, Luisa, Capitani, Donatella, Arnesi, Giuseppe, Biancari, Tiziano, Giannino, Donato (2020): Corrigendum to "Insights into sucrose pathway of chicory stems by integrative transcriptomic and metabolic analyses" [Phytochemistry Vol. 167 (November 2019) 112086. Phytochemistry (112420) 177: 112086, DOI: 10.1016/j.phytochem.2019.112086, URL: http://dx.doi.org/10.1016/j.phytochem.2019.11208
UNSATURATED ALKOXY-SUBSTITUTED POLY(P-PHENYLENE 1,3,4-OXADIAZOLE)S: SYNTHESIS AND CHEMICAL-PHYSICAL CHARACTERIZATION.
No full textNuclear Magnetic Resonance to investigate inorganic porous materials of interest in the cultural heritage field
No full textNuclear Magnetic Resonance (NMR) can be successfully applied to a wide number of organic, inorganic, and hybrid materials regarding cultural heritage. High-resolution solid-state NMR provides information on the structure of materials, and portable NMR devices allow non-destructive and non-invasive in situ investigation of variably sized objects. This result is possible by combining open magnets and surface radiofrequency coils to generate a sensitive volume external to the sensor and inside the object under investigation. In this paper we focus on the application of NMR to investigate inorganic porous materials such as pottery, plasters, and stones from cultural heritage sites. 27Al MAS and 3QMAS, and 29Si MAS high-resolution solid-state NMR along with spectral deconvolution allowed for the investigation of the chemical structure of ancient pottery. Portable unilateral NMR was used to investigate, in a non-invasive and non-destructive way, the porous structure of pottery. The effect of protective-consolidating treatments on plaster was carefully investigated by 1H NMR depth profiles that allowed for scanning with micrometric resolution of plaster specimens. Changes occurring in the total open porosity after treatments were also evaluated. NMR diffusion measurements provided information on the restricted geometry of the porous structure of two types of biocalcarenite and tuff. A suitable processing of collected data enabled us to define the average pore radius and pores' interconnection in these material
13C Solid State Nuclear Magnetic Resonance and μ-Raman Spectroscopic Characterization of Sicilian Amber
No full text13C cross-polarization magic angle spinning (CPMAS) nuclear magnetic resonance (NMR) and μ-Raman spectroscopy were applied to characterize Sicilian amber samples. The main goal of this work was to supply a complete study of simetite, highlighting discriminating criteria useful to distinguish Sicilian amber from fossil resins from other regions and laying the foundations for building a spectroscopic database of Sicilian amber. With this aim, a private collection of unrefined simetite samples and fossil resins from the Baltic region and Dominican Republic was analyzed. Overall, the obtained spectra permitted simetite to be distinguished from the other resins. In addition, principal component analysis (PCA) was applied to the spectroscopic data, allowing the clustering of simetite samples with respect to the Baltic and Dominican samples and to group the simetite samples in two sets, depending on their maturity. Finally, the analysis of loadings allowed for a better understanding of the spectral features that mainly influenced the discriminating characteristics of the investigated ambers
Characterization of pears during drying by conventional technique and portable non invasive NMR
Full text linkDrying is an important process for the conservation and subsequent marketing of fruits due to their high water
activity which makes them highly perishable. Dried products have to meet high quality standards, and one of
the most important aspects in fruit drying is the need to obtain products with uniform organoleptic properties.
Therefore, the knowledge and the optimization of drying process are very important in order to minimize
thermal damage and quality loss.
In the case of pears, sugar concentrations are relatively high (60–75 g/100 g dry basis) and greatly increase
as water evaporates, offering, combined with fruit shrinkage, an additional resistance to moisture transfer from
the fruit.
In this study, the effect of drying on properties of pear samples (Pyrus Communis ‘Conference’) was analysed.
In particular, the water transport mechanism was investigated in pear during drying process at 50 °C. The
drying kinetics were obtained by standard weight measurements and the water loss in chosen sample
sections (exterior, intermediate and central sections) was evaluated.
The drying moisture profiles of samples were also investigated by portable NMR, a non-invasive and nondestructive
technique. The water loss obtained by standard weight measurement and the extent of shrinkage
obtained by means of a vernier calliper were found to be in a good agreement with the results obtained by
portable NM
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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